Php function accumulation summary

Math function: 10 commonly used values. Abs & mdash; absolute value: acos & mdash; arccosine: ACO & mdash; archyperbolic cosine asin & mdash; arcsin asinh & mdash; archyperbolic sine atan2 & mdash; the arc tangent of the two parameters atan & mdash; arc tangent atanh & mdash; reverse hyperbolic tangent ba

Math function:
10 commonly used red labels.

Abs-absolute value
Acos-arccosine
Acossh-inverse hyperbolic cosine
Asin-arcsin
Asinh-Inverse hyperbolic sine
Atan2-arc tangent of two parameters
Atan-arc tangent
Atanh-antihyperbolic tangent
Base_convert-convert a number between any hexadecimal values
Bindec-Convert binary to decimal
Ceil-integer in one method
Cos-cosine
Cosh-hyperbolic cosine
Decbin-decimal to binary
Dechex-decimal to hexadecimal
Decoct-decimal to octal
Deg 2rad-converts degrees to radians
Exp-calculate the e index
Expm1-returns exp (number)-1. even if the number value is close to zero, the exact result can be calculated.
Floor-rounding
Fmod-returns the remainder of the floating point number of the division.
Getrandmax-display the maximum possible values of a random number
Hexdec-hexadecimal conversion to decimal
Hypot-calculates the oblique edge length of the angular triangle
Is_finite-determine if it is a finite value
Is_infinite-determines if it is an infinite value
Is_nan-determine whether it is a valid value
Lcg_value-composite linear coequal generator
Log10-base-10 logarithm
Log1p-return log (1 + number), even when the number value is close to zero, the accurate result can be calculated.
Log-Natural logarithm
Max-find the maximum value
Min-find the minimum value
Mt_getrandmax-display the maximum possible value of a random number
Mt_rand-generate better random numbers
Mt_srand-play a better random number generator seed
Octdec-octal to decimal
Pi-obtain the circumference rate value
Pow-exponential expression
Rad2deg-converts radians to degrees.
Rand-generate a random integer
Round-rounding floating point numbers
Sin-sine
Sinh-hyperbolic sine
Sqrt-square root
Srand-broadcast the seed of the random number generator
Tan-tangent
Tanh-hyperbolic tangent

 

String functions:

Learn at least 20. Usually marked with red.

Addcslashes-escape characters in strings using backslash in the C-language style
Addslashes-use a backslash to reference a string
Bin2hex-Convert binary data to hexadecimal representation
Alias of chop-rtrim
Chr-return the specified character
Chunk_split-splits a string into small parts
Convert_cyr_string-converts a character from one Cyrillic to another.
Convert_uudecode-decodes a uencode string
Convert_uuencode-encode a string using uuencode
Count_chars-returns the characters used by the string.
Crc32-calculate the crc32 polynomial of a string
Crypt-unidirectional String hash
Echo-output one or more strings
Explode-use one string to separate another string
Fprintf-Write formatted strings to the stream
Get_html_translation_table-return the conversion table after using htmlspecialchars and htmlentities
Hebrev-convert the logical sequence Hebrew (logical-Hebrew) to the visual sequence Hebrew (visual-Hebrew)
Hebrevc-converts the logical sequence Hebrew (logical-Hebrew) to the visual sequence Hebrew (visual-Hebrew), and converts the line break
Html_entity_decode-Convert all HTML entities to their applicable characters
Htmlentities-Convert all applicable characters to HTML entities
Htmlspecialchars_decode-Convert special HTML entities back to characters
Htmlspecialchars-Convert special characters to HTML entities
Implode-Join array elements with a string
Join-alias implode
Lcfirst-Make a string's first character lowercase
Levenshtein-Calculate Levenshtein distance between two strings
Localeconv-Get numeric formatting information
Ltrim-Strip whitespace (or other characters) from the beginning of a string
Md5_file-calculate the MD5 hash value of the specified file
Md5-calculate the MD5 hash value of a string
Metaphone-Calculate the metaphone key of a string
Money_format-Formats a number as a currency string
Nl_langinfo-Query language and locale information
Nl2br-insert the HTML line feed mark before all new lines of the string
Number_format-Format a number with grouped thousands
Ord-returns the ASCII value of a character.
Parse_str-Parses the string into variables
Print-output string
Printf-output formatted string
Quoted_printable_decode-Convert a quoted-printable string to an 8-bit string
Quoted_printable_encode-Convert a 8 bit string to a quoted-printable string
Quotemeta-Quote meta characters
Rtrim-removes white spaces (or other characters) at the end of a string)
Setlocale-Set locale information
Sha1_file-calculate the sha1 hash value of the file
Sha1-calculate the sha1 hash value of the string
Similar_text-calculate the similarity between two strings
Soundex-Calculate the soundex key of a string
Sprintf-Return a formatted string
Sscanf-Parses input from a string according to a format
Str_getcsv-parses a CSV string as an array
Case-insensitive version of str_ireplace-str_replace
Str_pad-use another string to fill the string with the specified length
Str_repeat-repeat a string
Str_replace-substring replacement
Str_rot13-execute the ROT13 conversion on the string
Str_shuffle-randomly disconnects a string
Str_split-convert string to array
Str_word_count-returns the usage of words in the string
Strcasecmp-binary security comparison string (case insensitive)
Strchr-alias strstr
Strcmp-binary security string comparison
Strcoll-string comparison based on region settings
Strcspn-get the length of the starting substring of the unmatched mask
Strip_tags-remove HTML and PHP tags from strings
Stripcslashes-references a string escaped using addcslashes
Stripos-locate the first occurrence of a string (case insensitive)
Stripslashes-references a reference string
The stristr-strstr function is case-insensitive.
Strlen-get the string length
Strnatcasecmp-use the natural order algorithm to compare strings (case insensitive)
Strnatcmp-use a natural sorting algorithm to compare strings
Strncasecmp-several characters starting with a binary security comparison string (case insensitive)
Strncmp-several characters starting with a binary security comparison string
Strpbrk-find any character of a group of characters in a string
Strpos-locate the first occurrence of a string
Strrchr-find the last occurrence of a specified character in the string
Strrev-reverse string
Strripos-calculate the position of the last occurrence of the specified string in the target string (case insensitive)
Strrpos-calculate the position of the last occurrence of the specified string in the target string
Strsps-calculate the length of the first substring in a string that contains all characters in the specified character set.
Strstr-first appearance of the search string
Strtok-mark the delimiter
Strtolower-converts a string to lowercase
Strtoupper-converts a string to uppercase
Strtr-conversion of specified characters
Substr_compare-binary secure comparison string (compare the specified length from the offset position)
Substr_count-calculates the number of times a string appears.
Substr_replace-replace the substring of a string
Substr-returns the substring of the string.
Trim-removes spaces (or other characters) at the beginning and end of the string)
Ucfirst-converts the first letter of a string to uppercase
Ucwords-converts the first letter of each word in a string to uppercase
Vfprintf-Write formatted strings to the stream
Vprintf-output formatted string
Vsprintf-returns the formatted string
Wordwrap-the interrupt string is a specified number of strings.

 

Array functions

Learn at least 15 of them. Usually marked with red.

 

Array_change_key_case-returns an array of string keys in lowercase or uppercase.
Array_chunk-divide an array into multiple
Array_combine-creates an array and uses the value of one array as its key name, and the value of another array as its value
Array_count_values-count the number of occurrences of all values in the array
Array_diff_assoc-calculate the array's difference set with index check
Array_diff_key-use the key name to compare the difference set of the calculated array
Array_diff_uassoc-use the callback function provided by the user to perform an index check to calculate the array's difference set
Array_diff_ukey-use the callback function to compare the difference set of the calculated array with the key name
Array_diff-calculate the difference set of the array
Array_fill_keys-fill the array with the specified key and value
Array_fill-fill the array with the given value
Array_filter-filter elements in the array using the callback function
Array_flip-swap the keys and values in the array
Array_intersect_assoc-intersection of arrays computed by checking indexes
Array_intersect_key-use a key name to compare and calculate the intersection of arrays
Array_intersect_uassoc-returns the intersection of arrays computed by checking indexes and compares indexes with callback functions.
Array_intersect_ukey-use the callback function to compare key names to calculate the intersection of arrays
Array_intersect-calculates the intersection of arrays
Array_key_exists-check whether the given key name or index exists in the array
Array_keys-returns all the key names in the array.
Array_map-calls the callback function to the unit of the given array.
Array_merge_recursive-recursively merge one or more arrays
Array_merge-merge one or more arrays
Array_multisort-sorts multiple arrays or multi-dimensional arrays.
Array_pad-fill the array with a value to the specified length
Array_pop-bring up the last unit of the array (Out Stack)
Array_product-calculate the product of all values in the array
Array_push-push one or more units to the end of the array (into the stack)
Array_rand-randomly retrieve one or more units from the array
Array_reduce-use callback functions to iteratively simplify an array to a single value
Array_replace_recursive-recursively replaces the element of the first array with the passed array
Array_replace-replace the element of the first array with the passed array
Array_reverse-returns an array with the opposite unit order.
Array_search-search for a given value in the array. if the value is successful, the corresponding key name is returned.
Array_shift-removes elements starting with an array from the array
Array_slice-extract a segment from the array
Array_splice-removes a part of the array and replaces it with other values.
Array_sum-calculates the sum of all values in the array
Array_udiff_assoc-calculate the difference set of the array with index check and use the callback function to compare data
Array_udiff_uassoc-calculate the difference set of the array with index check, and use the callback function to compare data and indexes.
Array_udiff-use the callback function to compare data to calculate the difference set of the array
Array_uintersect_assoc-returns the intersection of arrays computed by checking indexes and compares data with callback functions.
Array_uintersect_uassoc-returns the intersection of arrays computed by checking indexes and compares data and indexes using callback functions.
Array_uintersect-calculate the intersection of arrays and use the callback function to compare data
Array_unique-Remove repeated values from the array
Array_unshift-insert one or more units at the beginning of the array
Array_values-returns all values in the array.
Array_walk_recursive-recursively applies user functions to each member in the array
Array_walk-apply user functions to each member in the array
Array-create an array
Arsort-sorts arrays in reverse order and maintains the index relationship.
Asort-sorts arrays and maintains the index relationship
Compact-create an array, including variable names and their values
Count-calculates the number of units in the array or the number of attributes in the object.
Current-returns the current cell in the array.
Each-returns the current key/value pair in the array and moves the array pointer one step forward.
End-points the internal pointer of the array to the last unit.
Extract-import the variable from the array to the current symbol table
In_array-check whether a value exists in the array
Key-get the key name from the associated array
Krsort-sort arrays in reverse order by key name
Ksort-sort the array by key name
List-assign values in the array to some variables
Natcasesort-use the "natural sorting" algorithm to sort arrays by case-insensitive letters
Natsort-sort arrays using the "natural sorting" algorithm
Next-move the internal pointer in the array to a forward position.
Alias of pos-current
Prev-returns the internal pointer of the array to one position.
Range-create an array containing the specified range units
Reset-point the internal pointer of the array to the first unit
Rsort-reverse sorting of arrays
Shuffle-disrupt the array
Alias of sizeof-count
Sort-sort arrays
Uasort-sort the values in the array using the user-defined comparison function and maintain the index Association
Uksort-sort the key names in the array using the user-defined comparison function
Usort-use a user-defined comparison function to sort the values in the array